I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
mama mamma mamba mammae maim mamie mammy mamey mambo mammey mammie mammee mum mom mim mem meme memo mime mome momi mumm mumu mimeo momma mommy mummy
ama gama lama llama mama ma am
mama mamba mambo mamey mamie mamma mammae mammee mammey mammie mammy ma mm am